How to enable RSTP

Cisco switches by default run PVST+ (Per VLAN Spanning Tree+) which is compatible with 802.1d STP. Most newer switches support PVST+, Rapid-PVST+ & MST. With IOS-based switches you can check what version you are running with the command 'show spanning-tree summary':

switch#show spanning-tree summary

Switch is in rapid-pvst mode

<<<< Output Omitted >>>

switch#

To change the STP mode use the global configuration command 'spanning-tree mode XXX':

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